21883078721 has 8 divisors (see below), whose sum is σ = 25290236160. Its totient is φ = 18546172128.

The previous prime is 21883078703. The next prime is 21883078727. The reversal of 21883078721 is 12787038812.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21883078721 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21883078727) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17562041 + ... + 17563286.

It is an arithmetic number, because the mean of its divisors is an integer number (3161279520).

Almost surely, 2^21883078721 is an apocalyptic number.

It is an amenable number.

21883078721 is a deficient number, since it is larger than the sum of its proper divisors (3407157439).

21883078721 is an equidigital number, since it uses as much as digits as its factorization.

21883078721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35125423.

The product of its (nonzero) digits is 301056, while the sum is 47.

The spelling of 21883078721 in words is "twenty-one billion, eight hundred eighty-three million, seventy-eight thousand, seven hundred twenty-one".